Celtavian, it is going to be as deadly as you want it to be.
You seem to want to have a discussion "look how deadly it is, I don't want it to be that deadly, but my hands are tied" but I won't bite.
The simple truth is that the escape will be exactly as hard as you the DM makes it.
And more to the point, the corrollary: if the escape is hard it is because you made it hard; if the escape is easy it is because you made it easy.
Since changing stuff from the printed book is utterly trivial and the first thing any seasoned DM will do, I really see no point in having the aforementioned discussion, since it boils down to this dialog:
- "The book makes the escape too hard"
- "Then change it"
Why would you continue the discussion? You've already answered my question. I'm not looking for an argument. I'm looking for input from people that have run the encounter as to how they used the pieces available. Now I'd like to hear how other people ran it.
I'm leaning towards running it as is and seeing who lives. I'd like to hear how that went from some others. You ran it softer than I would or maybe your party was better set up for stealth. I don't know. Given the number of prisoners, I don't expect the party to be able to stealth out if they take anyone else with them. I also expect they'll need to decide who will be cannon fodder. I plan to have the giant spiders go after people. They are guard dogs for the prison. I'm assuming they are trained as such and will react as such.